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  • UVa 10879 Code Refactoring

    Problem B
    Code Refactoring
    Time Limit: 2 seconds
    "Harry, my dream is a code waiting to be
    broken. Break the code, solve the crime."

    Agent Cooper

    Several algorithms in modern cryptography are based on the fact that factoring large numbers is difficult. Alicia and Bobby know this, so they have decided to design their own encryption scheme based on factoring. Their algorithm depends on a secret code, K, that Alicia sends to Bobby before sending him an encrypted message. After listening carefully to Alicia's description, Yvette says, "But if I can intercept K and factor it into two positive integers, A and B, I would break your encryption scheme! And the K values you use are at most 10,000,000. Hey, this is so easy; I can even factor it twice, into two different pairs of integers!"

    Input
    The first line of input gives the number of cases, N (at most 25000). N test cases follow. Each one contains the code, K, on a line by itself.

    Output
    For each test case, output one line containing "Case #xK = A * B = C * D", where ABC and D are different positive integers larger than 1. A solution will always exist.

    Sample Input Sample Output
    3
    120
    210
    10000000
    
    Case #1: 120 = 12 * 10 = 6 * 20
    Case #2: 210 = 7 * 30 = 70 * 3
    Case #3: 10000000 = 10 * 1000000 = 100 * 100000
    

    Problemsetter: Igor Naverniouk

    大水题一道,把一个数分解成两个数的乘积,要求出两种分法。

     1 #include<cstdio>
     2 #include<cmath>
     3 
     4 using namespace std;
     5 
     6 int main()
     7 {
     8     int kase;
     9 
    10     scanf("%d",&kase);
    11 
    12     for(int n=1;n<=kase;n++)
    13     {
    14         int k,a=-1,b=-1,c,d;
    15 
    16         scanf("%d",&k);
    17 
    18         int mid=sqrt(k)+0.5;
    19 
    20         for(int i=2;i<=mid;i++)
    21         {
    22             int j=k/i;
    23             if(i*j==k)
    24             {
    25                 if(a==-1&&b==-1)
    26                 {
    27                     a=i;
    28                     b=j;
    29                 }
    30                 else if(i!=a&&i!=b)
    31                 {
    32                     c=i;
    33                     d=j;
    34                     break;
    35                 }
    36             }
    37         }
    38 
    39         printf("Case #%d: %d = %d * %d = %d * %d
    ",n,k,a,b,c,d);
    40     }
    41 
    42     return 0;
    43 }
    [C++]
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  • 原文地址:https://www.cnblogs.com/lzj-0218/p/3536723.html
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